P0748
SOLENOID VALVES - P0743, 48, 53, 58The following tests are performed continuously by a background task. If a fault is detected, it is filtered for a set period. When filtering ends a fault code is stored in the TCM and action is taken to ensure the integrity of the system.
During limp home mode the internal relay is turned off to remove the supply to the solenoids and the gearbox with default to fourth gear (if a forward gear is already selected) and third gear (if P.R.N.). Selecting N and then D will engage 3rd gear only.
Each test checks that the feedback from the output stage module is consistent with the driven state of the solenoid output, detects short circuit to ground, short circuit to battery voltage and open circuit.
^ Torque Converter Clutch System - P0743
^ Pressure Control Solenoid Electrical - P0748
^ Shift Solenoid A Electrical - P0753
^ Shift Solenoid B Electrical - P0758
Possible Causes:
Faulty valve.
Faulty harness wiring 7 connectors.
Effects:
MIL illuminated.
Transmission warning lamp illuminated.
Maximum fluid pressure applied.
Limp home mode applied.
Remedy:
Renew valve.
Repair or renew harness/connector.
Troubleshooting Schematics
Key To Schematic Diagrams
1. Transmission Control Module (TCM)
2. Transmission Unit
3. TCM Multi-pin Connector
4. Transmission Rotary Switch
5. Transmission Connector Plug
6. Engine Control Module
7. Instrument Pack
8. ABS/Traction Control Control Module
9. Kickdown Switch
Pin Outs